Airtac BU Double Female Thread Straight Connector BU0101-S
SUS304 stainless variant (-S)The AirTAC Airtac BU Double Female Thread Straight Connector BU0101-S is a genuine double female connector rated to 3.0 MPa proof pressure and 0 to +150 °C, for joining threaded pipe runs.
- TypeDouble female connector
- SeriesBU
- Working pressure0 - 1.0 MPa (0 - 10 kgf/cm2)
- Proof pressure3.0 MPa
- Temperature0 to +150 °C
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac BU Double Female Thread Straight Connector BU0101-S
The BU0101-S is a double female connector: a solid SUS304 stainless body with a 1/8in PT female thread on each end. It joins two male-threaded ports or nipples of the same 1/8in size face to face, which is the cleanest way to extend a run or bridge a gap without adding a separate male stud. Because both ends are female and identical, there is no Thread I versus Thread II orientation to worry about - the part goes in either way round.
This family is a metal pipe-joint line, not a one-touch resin range. Working pressure is 0-1.0 MPa with a proof pressure of 3.0 MPa, and it is rated from 0 to 150 C with vacuum capability to -750 mmHg (10 Torr). Those figures are roughly double the proof rating and more than twice the temperature ceiling of the push-in resin fittings, which is exactly why a stainless BU shows up in hot, wash-down or chemically aggressive plant where a polymer fitting would creep or crack.
Airtac BU Double Female Thread Straight Connector BU0101-S Technical Specifications
| Model | Airtac BU Double Female Thread Straight Connector BU0101-S |
|---|---|
| Type | Double female connector |
| Series | BU |
| Connection | Threaded both ends |
| Body material | Stainless steel 304 (-S variant) |
| Working pressure | 0 - 1.0 MPa (0 - 10 kgf/cm2) |
|---|---|
| Negative pressure | -750 mmHg (10 Torr) |
| Proof pressure | 3.0 MPa |
| Temperature | 0 to +150 °C |
| Thread standard | PT (Rc tapered) unless the code says otherwise |
Nickel-plated metal body. AirTAC does not publish a per-part material breakdown for this family. This family is rated to 150 °C, but the TUBE is usually the limit - confirm your tubing's temperature rating before running it hot. Stainless (-S): SUS304 body throughout, for copper-free and corrosive environments. Pressure and temperature ratings are unchanged from the nickel-plated version. AirTAC publishes flow as a characteristic curve rather than a single figure, so no L/min value is listed.
Model Code: Airtac BU Double Female Thread Straight Connector BU0101-S
| BU | Double female connector. |
|---|---|
| 4 / 6 / 8 / 10 / 12 | Tube outside diameter in mm (3.2 mm exists on the mini series). |
| M5 / 01 / 02 / 03 / 04 | Thread: M5x0.8, 1/8", 1/4", 3/8", 1/2" (M3 on the mini series). |
| D | Black. Blank = grey. |
| -S | Stainless-steel body. |
Fitting & Sealing Notes
- check Cut the tube square and clean before pushing it home, or the seal will leak.
- check Push until it stops, then pull back to check the chuck has gripped.
- check To release, press the collet ring fully in and pull the tube out.
- check Threaded parts arrive with sealant on the thread; M5 sizes use a sealing gasket.
- check Match the tube OD exactly - a 6 mm fitting will not hold 1/4" tube.
Where the Airtac BU Double Female Thread Straight Connector BU0101-S Is Used
Copper-free lab and plating-line air
In plating shops and analytical labs where copper ions can catalyse reactions or contaminate baths, the SUS304 body keeps the wetted path copper-free while shrugging off splashes and fume that would attack plated brass.
Laundry ironer and heat-sealer services
Steam-heated flatwork ironers and hot-bar sealers run compressed air and pilot lines right beside the heated zone. The 150 C rating lets a 1/8in BU0101-S sit in that ambient heat where a 70 C resin connector would soften.
Marine and fish-processing washdown
On fishing vessels and fish-processing decks, salt spray and daily hose-down destroy plated brass within seasons. A stainless 1/8in-to-1/8in splice in the instrument air or wash gun feed survives the same environment.
Is the Airtac BU Double Female Thread Straight Connector BU0101-S the Right Part?
The BU ladder only exists in equal-size pairs: 0101 (1/8in), 0202 (1/4in), 0303 (3/8in) and 0404 (1/2in). BU0101-S is the smallest part in that ladder, so there is no smaller double female to step down to - the only neighbour is BU0202-S, which steps both ports up to 1/4in PT and suits higher-flow branch lines. If you actually need a size change across the joint, BU is the wrong prefix: a BD or BB in a mixed code such as 0102 or 0203 is the part that reduces.
Compare it with BB0101, the male-male 1/8in version: choose BB when the mating ports are already female, choose this BU when both ends you are joining are male. For a blanking job on one unused 1/8in port, BZ01-S is the honest single-part answer rather than capping with two fittings.
Quick checklist
- ✓ Tube outside diameter matches exactly
- ✓ Thread size and standard match the port
- ✓ Working pressure within 0 - 1.0 MPa (0 - 10 kgf/cm2)
- ✓ Temperature within 0 to +150 °C
Airtac BU Double Female Thread Straight Connector BU0101-S FAQ
Working pressure 0-1.0 MPa (0-10 kgf/cm2), vacuum to -750 mmHg (10 Torr), proof pressure 3.0 MPa, and a temperature range of 0 to 150 C. The part is a double female connector with a 1/8in PT female thread on each end, made throughout in SUS304 stainless steel. No figure changes from the standard BU0101 - stainless swaps the material, not the ratings.
PT threads seal on the thread flanks, so wrap PTFE sealant tape or apply a suitable thread sealant to the male studs before threading them into each end, then tighten with a spanner on the hex body. AirTAC publishes no tightening torque for this part, so use normal good practice for 1/8in PT and stop at a sound metal-to-metal joint. Since both ends are the same female thread, it does not matter which stud goes into which end.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard parts are processed and dispatched in 3-5 business days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC Pipe Joints
Request a Quote for Airtac BU Double Female Thread Straight Connector BU0101-S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.